I know about 20 people that bought this game. Of them about 19 have sold it on because they were frustrated over the xp cap and I am considering doing the same. For the record I have never sold on any previous Halo game including Reach even though the cap on that game was irritating as well.
The reason the cap here bugs me so much more is
1 It doesent tell you when you hit the cap.
2 It is unclear exactly when you can start earning xp again
3 I can hit the cap after playing 4 games